Consciousness and Blindsight

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1 Consciousness and Blindsight Blindsight: The ability to respond appropriately to visual inputs while lacking the feeling of having seen them These patients are unable to see, but are able to reach for objects placed in their blind visual field. Implies that we need not be conscious of a stimulus in order to act on that stimulus

2 Blindsight

3 Blindsight

4 How do we see in color? What color is this dragon?

5 Color The dragon is anything but red. The dragon rejects the long wavelengths of light that to us are red- so red is reflected off and we see it. Also, light has no real color. It is our mind that perceives the color.

6 Color Vision Two Major Theories

7 Young-Helmholtz Trichromatic (three color) Theory Three types of cones: Red Blue Green These three types of cones can make millions of combinations of colors. Does not explain afterimages or color blindness well.

8 Color Blindness Genetic disorder in which people are blind to green or red colors. This supports the Trichromatic theory. (Some people just don t have certain receptors.) Ishihara Test Color blindness simulators 8

9 Opponent-Process theory The sensory receptors come in pairs. Red/Green Yellow/Blue Black/White If one color is stimulated, the other is inhibited.

10 Opponent-Process Theory In essence, certain cones are turned on by red and turned off by green The Black-White channel regulates intensity of the color Behavioral evidence: Color afterimages and simultaneous color contrast show the opposing pairings Types of color blindness are red/green and blue/yellow.

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14 Afterimages An optical illusion that causes a Sensation of sight to linger after the stimulus is removed. They are caused by fatigued cells in the retina responding to light.

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16 Opponent Colors Gaze at the middle of the flag for about 30 Seconds. When it disappears, stare at the dot and report whether or not you see Britain's flag.

17 Trichromatic and Opponent-Process Theories Combined Each theory describes physiological mechanisms in the visual system Trichromatic theory explains the responses of the cones in the retina Opponent-process theory explains neural response for cells connected to the cones further in the brain Essentially, the two theories together form the modern understanding of how we see the colors that we do.

18 Color Constancy Color of an object remains the same under different illuminations. However, when context changes the color of an object may look different. R. Beau Lotto at University College, London enses/astounding.htm 18

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20 Hearing istockphoto/thinkstock

21 Audition The sense or act of hearing The Stimulus Input: Sound Waves Sound waves are composed of changes in air pressure unfolding over time. Acoustical transduction: Conversion of sound waves into neural impulses in the hair cells of the inner ear. 21

22 Frequency (Pitch) Frequency (pitch): The dimension of frequency determined by the wavelength of sound. - Measured in Hertz (Hz) Wavelength: The distance from the peak of one wave to the peak of the next. 22

23 Intensity (Loudness) Intensity (Loudness): Amount of energy in a wave, determined by the amplitude, relates to the perceived loudness. - Measured in Decibels (db) 23

24 Loudness of Sound 120dB 70dB Tinnitus simulation Tinnitus: the perception of sound within the human ear when no external sound is present. (So, another example of???) Latin for ringing ringing is only one of the sounds one may perceive. Result of prolonged exposure to loud sounds. 24

25 The Ear Outer Ear: Pinna. Collects sounds. Middle Ear: Chamber between eardrum and cochlea containing three tiny bones (hammer, anvil, stirrup) that concentrate the vibrations of the eardrum on the cochlea s oval window. Inner Ear: Innermost part of the ear, containing the cochlea, semicircular canals, and vestibular sacs. 25

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